John h



J. H. KEYSER.

Hot-Air Furnace.

No. 62,962. Patented March 19, 1867.

JOHN 11. nurses, or NEW Your, N. Y. Letters Patent No. 62,962, dated March 19, 1867.

RADIATING ATTACHMENT FOR HOT-AIR FURlilAGES.

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TO ALL WHOM IT MAY CNCERN:

Be it known that I, JOHN H! KEYSER, cfthe city and county of New York, in the State of New York, have invented a new and improved Radiator for Hot-Air Furnaces; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being bad to the accompanying drawings, making'a partof this specification, in which- Figure 1 is a front elevation of a portion of a hot-air furnace, having my improved radiator applied to it.

Figure 2 is a vertical section taken centrally through the furnace and regulator.

Figure 3 is a section throughthe radiator taken in the horizontal plane indicated by red line a: w. Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to an improvement in the construction of radiators for hot-air furnaces; and consists in so constructing and arranging the 'flues through which the products of combustion pass, that two or more chambers or radiators arranged directly over the fire-chamber will be uniformly heated, and the products of combustion conducted upward to the highest chamber or radiator, and then caused to descend and pass out through the lowermost radiator, without the use of valves, dampers, or anything of the kind, as will be hereinafter described. i l

I To enable others skilled in theart to understand my invention, Iwill describe its construction and operation.

In the accompanying drawings I have represented my invention applied to a very simple form of furnace, consisting of a hollow base, A, an-ash-pit, B, a fire-pot, O, and a dome or fire-chamber, D. Through the crown of the fire-chamber D an opening, a, is made for the upward passage of the heatedproducts of combustion into the radiators,-whioh are applied on top of said dome. The radiators consist of two hollow, double-convex, circular drums E F, arranged in horizontal planes .one above the other, and connected together at suitable distance apart by means of vertical pipes 6'7), 1; b and c, as shown in the drawings. The central pipec forms a direct flue for the passageof the products of combustion from the fire-chamber D into the upperradiating drum-F. This pipe passes unobstructedly through the lower drum E, and through the space between the twodrums, andconducts the heated products of combustion into the centre of the upper drum, as indicated by the direction of thearrows in fig. 2-. By thus delivering the products of combustion int-0 the centre of the hollow drum F they will expand laterally in every direction and uniformly heat this drunn The vertical pipes b, which surround the central pipe e form descending dues forconducting the products of combustion from the upper drum F into the lower drum E, from whichlatter tli-e products will be conducted oif through the exit pipe g. The descending fiues b are arranged around the central ascending flue c, for the purpose of difi'using the heated products of combustion throughout the two drums, and preventing such products from being carried off in one direct course, as would be the case if a single descending flue only were employed. The central ascending flue passing upward through the centre of the lower radiating drum, in combination with the descending flues leading fr m the drum F into drum E, and the escape flue 9, leading from the drum E, enables one to efi'ect the object above set forth without the use of a damper. The furnace and air-heating drums and radiating pipes are all enclosed by a jacket or casing which is not shown in the drawings, so that air admitted through the extended base A of the furnace will .rise and circulate through the casing and pass off at or near the top thereof, in the usual manner. I am aware that it is not new to employ ascending and descending flucs regulated by a damper as set forth in the Patent No. 59,173 In this arrangement the products of combustion takeadirect course outward from the lower chamber when the damper is turned in one direction, and when it is turned in an opposite direction the products will ascend through one flue and pass downward and out through anotherfiue, taking a direct course. i This I do not desire to claim, for while it may serve the purpose claimed for it, it is not desirable for a hot-air furnace. By my plana'greate'r amount of heat is utilized and a greater area of radiating surface heated, while at the same time a damper is dispensed with. I do not confine my invention to the form and number of radiating drums described, nor to a definite number of vertical fiues. I pro-fer to adopt the double-convex drums, as the dust and coal'ashes which are carried into them will fall by their owngravity towardand through the vertical dues and thus return to the fire-pot. By my invention a greater number of radiating drums than two-may be employed, provided the central flue be arranged upon; the principle herein explained, and all the drums be connected together by descending flucs. I do not desire to be understood as not employing any for regulating-the draught of the furnace, as the usual dampers or regulators may be applied to the feed opening and ash-pit door. I do not wish to be understood as laying claim or invention to anything shown or described in the patents of Adolphus Lotze, Qc'tober 30, 1849, and M. B. Dyott, May 22, 1855; nor to anything shown and described in the withdrawn, rejected application of James Root, 1852.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

In the construction of radiators to be applied to hot-air furnaces, I claim the arrangement of a central ascending flue, a, passing through one or more radiating drums and leading into the centre of an upper drum, in combination with descending flues arranged around said flue, e, and communicating with the lowermost drum and an exit pipe g, so that Without the use of a damper the products of combustion rising from the fire-chamber of the furnace shall be equally difi'uscd throughout the said drums and pipes, substantially as described.

11 JOHN H. KEYSER.

Witnesses: I WILLIAM TURTON, NATHAN L. ELY. 

